Table 2 Half-lives of the target pesticides in soil under dark and light conditions
Category | Pesticide | Dark | Light | ||||
|---|---|---|---|---|---|---|---|
Dynamic level | Half-life (d) | Residual rate after 6Â days (%) | Dynamic level | Half-life (d) | Residual rate after 14Â days (%) | ||
Insecticide | Nitenpyram | Second-order | 4.1 | 40.3 | First-order | 4.1 | 8.8 |
Acetamiprid | Second-order | 2.6 | 31.5 | First-order | 2.5 | 2.9 | |
Chlorantraniliprole | Second-order | 53.5 | 96.3 | Second-order | 56.3 | 84.1 | |
Emamectin benzoate | Second-order | 18.6 | 79.1 | Second-order | 16.1 | 57.6 | |
Buprofezin | Second-order | 18.8 | 75.8 | Second-order | 22.8 | 63.7 | |
Avermectin B1A | Zero-order | 58.4 | 96.4 | Second-order | 6.1 | 33.6 | |
Fungicide | Carbendazim | Second-order | 6.7 | 50.9 | First-order | 9.1 | 30.9 |
Oxadixyl | Second-order | 9.8 | 61.1 | Second-order | 17.9 | 53.1 | |
Metalaxyl | Second-order | 110 | 101.4 | Second-order | 104 | 91.7 | |
Diethofencarb | Second-order | 19.8 | 82.0 | Zero-order | 6.7 | 5.5 | |
Boscalid | Second-order | 30.4 | 88.4 | Second-order | 41.1 | 74.9 | |
Tebuconazole | Second-order | 29.8 | 88.1 | Second-order | 99.1 | 90.1 | |
Isoprothiolane | Second-order | 44.4 | 93.8 | Second-order | 80.3 | 90.0 | |
Hexaconazole | Second-order | 42.4 | 92.9 | Zero-order | 61.1 | 92.7 | |
Difenoconazole | Second-order | 46.1 | 92.3 | Second-order | 61.1 | 87.6 | |
Pyraclostrobin | Second-order | 34.0 | 90.8 | Second-order | 23.3 | 78.5 | |
Trifloxystrobin | First-order | 4.8 | 45.7 | First-order | 3.0 | 5.9 | |